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When a worn or mismatched sprocket causes chain skip, premature wear, or unexpected downtime on your drive system, finding an exact-fit replacement becomes urgent. Whether you are a maker building a custom conveyor, a hobbyist assembling a go-kart drivetrain, or a maintenance technician replacing worn components on light industrial equipment, having the right tooth count and pitch match is non-negotiable for smooth, reliable power transmission.
This flat sprocket is machined to suit 08B roller chain with a 12.7mm (1/2 inch) pitch. Available in tooth counts from 31T to 45T, each sprocket features a precision-bored center hub and evenly spaced teeth for consistent chain engagement. The flat plate (simplex) design keeps the profile compact and lightweight, making it well-suited for space-constrained drive assemblies.
Typical applications include 08B chain drive conveyor systems, small engine power transmission builds, DIY go-kart and mini-bike drivetrains, and light-duty industrial machinery sprocket replacement. The 31–45 tooth range covers a wide gear ratio spread, giving builders and engineers the flexibility to tune speed and torque output to their specific requirements.
| Chain Standard | ISO 08B / BS 08B Simplex |
|---|---|
| Chain Pitch | 12.7mm (1/2") |
| Tooth Count Range | 31T, 32T, 33T, 34T, 35T, 36T, 37T, 38T, 39T, 40T, 45T |
| Sprocket Type | Flat / Simplex (Single Strand) |
| Bore Diameter | See variant options |
| Pitch Circle Diameter | See variant options |
| Hub Style | Flat plate (no hub projection) |
| Material | See variant options |
| Surface Finish | See variant options |
| Packing Quantity | 1 pcs per order |
| Weight | See variant options |
The tooth count determines your drive ratio. Divide the driven sprocket teeth by the drive sprocket teeth to get the ratio. A larger driven sprocket (more teeth) reduces output speed and increases torque; a smaller one does the opposite. For example, pairing a 15T drive sprocket with a 45T driven sprocket gives a 3:1 reduction. Use our tooth count range to fine-tune your speed and torque output to match your specific build requirements.
Yes. This sprocket is designed specifically for ISO 08B / BS 08B simplex roller chain with a 12.7mm (1/2") pitch. It will not fit 40 ANSI chain (also 1/2" pitch) because the roller diameter and inner link width differ between the ISO and ANSI standards. Always confirm your chain standard before ordering.
Bore diameter varies by tooth count and is listed in the variant details. If you need a specific bore size to match your shaft diameter, please check the variant specifications or contact us to confirm before purchasing. Many flat sprockets can also be re-bored by a machine shop to a custom diameter if needed.
Corrosion resistance depends on the material and surface finish of the specific variant. For outdoor or high-moisture environments, we recommend selecting a variant with a protective coating or using a compatible chain lubricant to extend service life. Contact us to confirm the finish specification for your chosen tooth count.
Yes — 08B simplex sprockets are widely used in go-kart and mini-bike builds. Verify that your existing chain is 08B (12.7mm pitch) and confirm the bore diameter matches your axle or jackshaft. The 31T–45T range gives you good flexibility for tuning top speed versus acceleration on small vehicle drivetrains.
A worn chain will cause accelerated sprocket tooth wear even on a new sprocket. To check chain wear, measure 12 links end-to-end: a new 08B chain should measure exactly 152.4mm (12 × 12.7mm). If the measured length exceeds 154mm or more, the chain has stretched beyond the recommended service limit and should be replaced at the same time as the sprocket to avoid premature wear on both components.
Each order is for one (1) sprocket in the tooth count you select. This lets you order exactly what your build requires — whether you need a single replacement or multiple units for a multi-stage drive system. Simply adjust the quantity in your cart if you need more than one.
